Touch Fin RPN

Touch Fin RPN

By Elvis Pfutzenreuter

  • Category: Finance
  • Release Date: 2014-12-07
  • Current Version: 4.21
  • Adult Rating: 4+
  • File Size: 49.46 MB
  • Developer: Elvis Pfutzenreuter
  • Compatibility: Requires iOS 10.0 or later.
Score: 4
From 110 Ratings


Touch Fin RPN is an RPN financial and scientific calculator that implements most features of the industry-standard HP-12C, including programming functions. It also implements a scientific RPN flavor that implements most functions of the beloved 11C. And even more flavors (10C-like, 16C-like) can be purchased within the app.



  • Not a scientific calculator

    By dwobma
    Without a pi key or any trig functions you can’t call this a scientific calculator. The best scientific calculator ever was the HP11C, one of what I’ve used almost daily for almost 35 years. Sorry to hear you are giving up on your Touch 11i App.
  • Versatile RPN Calculator — Well Designed

    By FlyBoyMcCall
    This is a well-designed, smoothly functioning, RPN calculator. I have not done a thorough test on accuracy but it appears to be accurate. Because the calculator is free, unobtrusive ads run in the upper right hand corner. Even the ads are well designed to be visible but not in the way. The designer has a flair.
  • Latest Update

    By 99Charles
    Since this update my screen is reversed. Is there a way to turn it?? It is annoying. Overall I really like the calculator and this app!! The new direction is annoying.
  • Great - but I have a comma problem

    By RHB12C
    This acts just like my old 12c. However, the comma will not float to the millions digit. It displays 10,00,000 instead of 1,000,000. Can’t figure out how to change it.
  • Persistent. Memory, very slow programming execution

    By Mikemputer
    I like the persistent memory because I have long (>100 lines) programs that I use often. However, program execution is painfully slow, especially for those using random numbers and subroutines.
  • Best RPN calculator-Problems with Apple XR

    By Wildpittbill
    I love this 12C calculator app. It functions exactly like my handheld HP 12C. However in upgrading my phone from an iPhone 6 to an XR, the app locks up the phone. The calculator works fine but it will not close and without a Home button I cannot get back to the main screen and have to reboot the device to exit. Am I doing something wrong here? I can’t use it otherwise which would be a shame.
  • The best HP as far as I’m concerned

    By ItsCosmo
    As a longtime HP user, I own many of the physical calculators and even purchased HP’s official 15C app. That app is OK but had some usability issues that HP never addressed, and appears to be abandoned now. When I tried the free version of Touch RPN, I knew I had a winner. The detailed rendering, keyboard feedback and vertical (portrait) layout are just what one would expect in a top of the line product. I purchased the Scientific Premium version and could not be happier. It was an easy decision to delete the HP app. The negative reviews you see here are either critical of the all-in-one version vs separate app approach, or from people who don’t know what RPN is. I have no concerns about the all-in-one version, but I do have a gripe. To say that an app supports Family Sharing when its only purchase option is via IAP is a flat-out scam, and this developer tarnishes its integrity by making such a claim. I wish Apple would put an end to this deceitful practice.
  • Not an improvement

    By Cheapskate01
    Agree with djhdjh that separate apps were more convenient than having all in one. Great emulations of the Voyager series HP calculators. But I miss having separate apps and being able to have more than one open at a time. Another hurt for Elvis Pfutzenreuter: For probably 99% of applications, the HP-11C and HP-12C are more than satisfactory. And guess what? Touch Fin contains the “free” version of both the HP-11C and HP-12C! The advertising is not intrusive and easily ignored - it’s up in the right hand corner where the HP logo would be. So, for 99% of users, why bother to purchase any of the “flavors”? For what it’s worth, apparently, Elvis cut one dollar off of each of the custom “flavors,” formerly individual apps. That came just after I had purchased the individual apps. I purchased the HP-12C, HP-15C, and HP-16C emulators JUST BEFORE they were “sunset.” I was really fortunate because I was able to download the iOS 6 versions of these apps on my iPod before the “sunset.” Thanks to iTunes, I have been able to harvest the iOS 6 and iOS 9 IPAs of these apps. Because I find these more useful than the all-in-one app, I’m keeping these individual apps and not using the all-in-one app. Overall, if I had to make a recommendation to Elvis, it would be: Please bring back the individual (11C, 12C, 15C, 16C, &c) apps. This just simply made more sense than the all-in-one app. Oh, yes. Really off-the-wall request here: Please implement Touch Fin for Windows 10! I really would appreciate having these calculators on my computer. Mac users would probably appreciate having them, as well.
  • Looks like garbage on iPhone X

    By Cybersnyder
    Everything is fine on older phones, but the layout is garbage on the larger screen. Avoid.
  • Basic math?

    By Astrostar1
    Basic math, divide and multiply, do not work. Is that intended with the free version?